, this is the third homicide in just two days. >> ama: oakland police are now teaming with other law enforcement agencies and a private security company to expand patrol in high-crime areas. shopping districts in montclair, piedmont, lake shore and other areas have seen a rise in robberies, burglaries and muggings. >> see fair amount of patrols of the shopping district, but we see a lot of various alarm companies driving up and down our street where we live. >> i think it will work. very good idea. >> pool resources. >> ama: oakland police are also depending on the alameda county sheriffs office, chp, and b.a.r.t. police. >> an armed man who took two women hostage is recovering tonight. cameras caught the smoke of a concussion grenade fired into jack-in-the-box. a hostage was then rushed to safety by the police. the gunman's condition is unknown. police received a call of a robbery in progress. a four-hour standoff resulted. the other hostage was released safely. >> in san francisco officers say five men, at least one of whom was armed, terrorized people in a home invasion in richmond district.